the 250 dt990s are very hard to drive. the pricing of them is also a bit different.
the cheapest available is the dt990 pro 250ohm. typically $180-200
the rest are the premium version which are 32ohm, 250ohm or 600ohm.
besides having a different levels of ohm resistance, they are very similar to the pro version. the differences are that they sound a bit more "airy" and have less bass and a slightly different look to them with less clamp to the headband. not worth the price unless you need the 32 or 600 version and even then they are very overpriced given the almost zero performance difference.
for the price the 990 pro 250 is a good deal if the v-shaped sound profile with decent bass and crisp highs (but somewhat lacking mids) is what you like. it is called the "fun" sound profile and certainly makes things a bit more engaging if not 100% as-in-real-life. you WILL need an amplifier for it as they are hard to drive.
now, not sure if you want virtual surround or not. your motherboard may have something of that nature (so you can use the line out jack for it to an amp) though dolby headphone or sbx/cmss-3d are likely going to be better and those are found on soundcards.
you could run line out from your motherboard and get a decent quality amp which can drive the 990's great such as the schiit magni. this would let you use your onboard for processing and the amp to power.
a cheaper option (That introduces a bit of distortion) uses the powered headphone jack out of your motherboard and a cheaper amp connected to it (like a fiio e11, e10k or similar) since it would be double-amping the signal. slight quality decrease yes, but some people do this with a cheaper amp since they dont have the budget for a bigger one (or if they need to use it for travel use so CANT have a bigger amp)
if you wanted better virtual surround you could always use a soundcard in your pc to do the processing (xonar dg, dx or creative z) and an amp to do the powering (read above motherboard options, you have the same ones with a soundcard).
the third and last option is to use an external DAC and amp (like schiit magni and modi combo) you cannot use virtual surround with this option though you're likely to get the best (at least the least electrical noise distortion) for the money. it does one thing: good stereo sound and plugs in via usb (amp hooks up to dac).